Art Deco is a decorative style that became popular in the early twentieth century. It often uses repeated geometry, stepped shapes, symmetry, and rich-looking materials to create a sense of elegance.
Imagine a doorway framed by fan shapes and repeated lines, or a poster with strong geometry and a polished finish. A website may borrow these details to feel glamorous or historic.
Art Deco is a broad design period, not one exact template. Use ornament to support the mood, while keeping important information easy to read.